Bismuth oxyiodid methylene digallate and process of making same.



UNITED STATES PATENT OFFICE.

SAMUEL LEWIS SUMMERS, OF PHILADELPHIA, PENNSYLVANIA.

BISMUTH OXYIODID METHYLENE DIGALLATE AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 690,672, dated January '7, 1902. Application filed October 9, 1901. Serial No. 78,082. (No specimens.)

To all whom it may concern.-

Be it known that LSAMUEL LEWIS SUM- MERS, a citizen of the United States, residing at Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Bismuth Oxyiodid Methylene Digallate and Processof Producing the Same, of which the following is a full, clear, and exact description.

My invention relates to the production of a new methyl digallate of bismuth oxyiodid, having great utility as a pharmaceutical product; and my discovery comprehends the product as a new chemical body, as well as a particular process which I have invented for the production of the same. a

' Methylene digallate of bismuth has never been heretofore prepared save by the reaction of bismuth hydrate 0n methylene digallate acid, and this forms a bluish-gray powderof the formula 4(3 H O, +3BI(OH and containing about 28.4 per cent. of bismuth.

I have discovered that oxyiodid of bismuth will react on methylene digallic acid to produce a compound the result of the chemical union of those substances and which isessentiallya methylene digallate of the oxyiodid of that metal having the chemical formula Bi I O H O and which will be more stable and also contain a larger percentage of bismuthnamely, about 39.33 per cent-than the resultant of the reaction by bismuth hydrate and which possesses medicinal value imparting great utility to it as a pharmaceutical product.

My invention therefore consists in forming a methylene digallate. of a bismuth compound-specifically, the oxyiOdid-as hereinafter described.

One process by which may be prepared my new'product is as follows: A solution is prepared of gallic acid one hundred and seventy parts and formaldehyde thirty parts, and this is caused to react on a compound of bismuth nitrate three hundredand ninety-six parts, iodin one hundred and twenty-seven parts, and potassium iodid one hundred and six parts, which latter in admixture form a solid composition. The solution first named is of course the methylene digallic acid, (C H O and the composition upon which it is caused to react is bismuth oxyiodid, (BiOI,) either of which, however, may be otherwise prepared than above set forth. Stated in weights in lieu of parts as above given, I

form this oxyiodid by compounding nine and 5 5 five-tenths kilos of crystallized bismuth nitrate with 3.0elki10s of iodin and 2.54kilos'of potassium iodid. The reaction is efiected under constant stirring, and the methylene digallic acid is exhibited to the bismuth oxy- 6d iodid in a slightly-heated condition, say 90 Fahrenheit. Ilhe result of the reaction is a precipitate in the form of animpalpable pow= der, originally a greenish-black color. It is to bepurified by repeated washings untilthe washings become nearly colorless and the washed productbecomes of a reddish-brown color. It is then-collected and dried at a temperature not exceeding 60 centigrade,

'Whereupon it becomes of aslightly-lighter 76 brown color, which might be called a yellowish-red brown. Having thus described my invention, what I claim as new, and desire secured by-Letters Patent, is I 1. The product described, which is the methylene digallate of bismuth oxyiodid, which in a dry state is an impalpable :powder, of a reddish-brown color, contains about 39.33 percent. of metallic bismuth, and about 24.1 per cent. of iodin, insoluble in water,

and in alcohol, decomposes slowlyin a moist atmosphere, and has the chemical formula I 2 2 15 12 12- 2. The process herein descmbed of producing bismuth oxyiodid methylene digallate, which consists in reacting on bismuth oxyiodid with methylene digallic'acid, with constant stirring, and then repeatedly washing the precipitate and evaporating its contained moisture at a temperature not exceeding 60 centigrade.

3. The process herein described of producing bismuth oxyiodid methylene digallate, which consists in reacting on a compound of y 95 crystallized bismuth nitrate, iodin and potassium iodid, with methylene digallic acid, with constant stirring, and then repeatedly washing the precipitate and evaporating its contained moisture at a temperature not exceeding 60 centigrade. I

In testimony whereof I have hereunto affixed my signature this 8th day of October, A. D. 1901.

Witnesses:

GEO. W. REED, H. T. FENTON.

SAMUEL LEWIS SUMMERS. l 7 

